"Can't get stack offset 0 from [] @ 0" error reported by DumbMethods$NullMethodsSubDetector

[iloveeclipse]

For the trivially wrong test code below (derived from a more complex text case where some code was per mistake added after fail()), spotbugs 4.8.0 reports an execution error.

package xxx;
public class Regression {
    public void testUnreachableCode() {
        org.junit.Assert.fail();
        System.err.println("Not reachable code");
    }
}

Error reported:

java.lang.IllegalArgumentException: 0 is not a value stack offset
	at edu.umd.cs.findbugs.OpcodeStack.getStackItem(OpcodeStack.java:3277)
	at edu.umd.cs.findbugs.detect.DumbMethods$NullMethodsSubDetector.sawOpcode(DumbMethods.java:175)
	at edu.umd.cs.findbugs.detect.DumbMethods.sawOpcode(DumbMethods.java:916)
	at edu.umd.cs.findbugs.visitclass.DismantleBytecode.visit(DismantleBytecode.java:878)
	at edu.umd.cs.findbugs.detect.DumbMethods.visit(DumbMethods.java:1565)
	at edu.umd.cs.findbugs.visitclass.BetterVisitor.visitCode(BetterVisitor.java:218)
	at edu.umd.cs.findbugs.visitclass.PreorderVisitor.visitCode(PreorderVisitor.java:250)
	at edu.umd.cs.findbugs.bcel.OpcodeStackDetector.visitCode(OpcodeStackDetector.java:65)
	at org.apache.bcel.classfile.Code.accept(Code.java:121)
	at edu.umd.cs.findbugs.visitclass.PreorderVisitor.doVisitMethod(PreorderVisitor.java:322)
	at edu.umd.cs.findbugs.visitclass.PreorderVisitor.visitJavaClass(PreorderVisitor.java:404)
	at org.apache.bcel.classfile.JavaClass.accept(JavaClass.java:244)
	at edu.umd.cs.findbugs.BytecodeScanningDetector.visitClassContext(BytecodeScanningDetector.java:38)
	at edu.umd.cs.findbugs.DetectorToDetector2Adapter.visitClass(DetectorToDetector2Adapter.java:76)
	at edu.umd.cs.findbugs.FindBugs2.lambda$analyzeApplication$1(FindBugs2.java:1108)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at edu.umd.cs.findbugs.CurrentThreadExecutorService.execute(CurrentThreadExecutorService.java:86)
	at java.base/java.util.concurrent.AbstractExecutorService.invokeAll(AbstractExecutorService.java:247)
	at edu.umd.cs.findbugs.FindBugs2.analyzeApplication(FindBugs2.java:1118)
	at edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:309)

[hazendaz]

fixed in #2643